STALK-EYED CRUSTACEA 349 



Range. — East Coast of America, from Cape Cod to 

 Brazil. 



I. Hippa emerita. 



Hippa emerita . . Latreille, Lamarck, Desmarest, 



H. Milne Edwards, Gibbes, 

 Dana, Miers. 



Hippa talpoidea . . Say. 



Fabricius. 



Hippa eitierita \ 

 Astactis emeritus) 

 Cancer emeritus . . Linne 



Body very convex. Median lobe of the front very 

 triangular, subacute, separated from the lateral lobes by 

 a distance usually greater than its own breadth at base ; 

 the lateral frontal lobes are narrow, acute, and much more 

 prominent than the median lobe. Carapace marked with 

 irregular, crenulated, transverse lines, which are nearly 

 obliterated on the sides and towards the posterior 

 margin, and with a distinctly marked postfrontal and 

 postgastric incised line. Eyes very long and slender 

 Internal antennae densely hairy. Second joint of the 

 external antennae with three spines on its distal ex- 

 tremity, of which the median is much the longest, and 

 directed slightly outwards. Fourth joint of external 

 maxillipedes with the lobe at its antero-internal angle 

 triangular and subacute. Terminal joint of the second 

 and third pair of legs falcate, very broad at base, narrow 

 and subacute in their terminal halves. 



Rami of the appendages of the penultimate abdominal 

 segment short, the outer shorter and broader oval than 

 the inner. 



Range. — Brazil, Venezuela, Mexico, Martinique, Cuba, 

 United States. 



